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CVE-2026-72640— Unintended Proxy or Intermediary in Elastic Cloud on Kubernetes Leading to Cross-Namespace Secret Disclosure

Quick assessment

Affected
Elastic Eck Operator
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Elastic Eck Operator是荷兰Elastic公司的一个管理Kubernetes搜索集群的控制器。 Elastic Eck Operator 3.0.0版本至3.4.1版本存在服务端请求伪造漏洞，该漏洞源于ECK operator从secret注解中读取secret引用列表时未验证引用的授权，可能导致用户利用operator的集群级secret权限将其他命名空间的secret复制到可读的secret中，造成敏感信息泄露。

CVSS 6.5 · Medium EPSS 0.25% · P16

Affected Version Matrix 1

VendorProduct Version RangeStatus
Elastic Eck Operator 3.0.0≤ 3.4.1 affected
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I. Basic Information for CVE-2026-72640

Vulnerability Information
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Vulnerability Title
Unintended Proxy or Intermediary in Elastic Cloud on Kubernetes Leading to Cross-Namespace Secret Disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
The Elastic Cloud on Kubernetes (ECK) operator reads a list of secret references from an annotation on secrets it manages, and it accepts the namespace recorded in each reference without validating that the reference is authorized for the resource being reconciled. A user whose Kubernetes permissions are limited to their own namespace can write that annotation, trigger a reconcile, and cause the operator to use its cluster-wide secret permissions to copy the contents of a secret from any other namespace into a secret the user can read.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未有动机的代理或中间人(混淆代理)
Source: CVE Program / CVE List V5
Vulnerability Title
Elastic Eck Operator 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Elastic Eck Operator是荷兰Elastic公司的一个管理Kubernetes搜索集群的控制器。 Elastic Eck Operator 3.0.0版本至3.4.1版本存在服务端请求伪造漏洞，该漏洞源于ECK operator从secret注解中读取secret引用列表时未验证引用的授权，可能导致用户利用operator的集群级secret权限将其他命名空间的secret复制到可读的secret中，造成敏感信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elastic Eck Operator 3.0.0 ~ 3.4.1 -

II. Public POCs for CVE-2026-72640

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III. Intelligence Information for CVE-2026-72640

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Vendor Advisories for CVE-2026-72640 (1)

Same Patch Batch · Elastic · 2026-08-13 · 48 CVEs total

CVE-2026-72642 8.8 HIGH Use of Out-of-range Pointer Offset in the Elasticsearch Machine Learning Native Inference
CVE-2026-72665 8.1 HIGH Missing Authorization in Kibana Leading to Unauthorized Execution of Host Response Actions
CVE-2026-72670 7.7 HIGH Exposure of Sensitive Information to an Unauthorized Actor in Kibana Leading to Disclosure
CVE-2026-72672 7.7 HIGH Incorrect Authorization in Kibana Leading to Disclosure of Elastic Defend Endpoint Event D
CVE-2026-72669 7.6 HIGH Missing Authorization in Kibana Leading to Cross-User Information Disclosure and Data Tamp
CVE-2026-72658 7.3 HIGH Cross-Site Request Forgery in Kibana Leading to Privilege Escalation
CVE-2026-72677 7.3 HIGH Relative Path Traversal in Kibana Fleet Leading to Unauthorized Deletion of Users and Othe
CVE-2026-72675 7.1 HIGH Missing Authorization in Kibana Machine Learning Leading to Cross-Space Information Disclo
CVE-2026-72629 7.1 HIGH Authorization Bypass Through User-Controlled Key in Kibana Leading to Cross-Space Access t
CVE-2026-72632 7.1 HIGH Observable Discrepancy in Kibana Fleet Leading to Disclosure of Elastic Agent Elasticsearc
CVE-2026-72630 7.1 HIGH Incorrect Authorization in Kibana Fleet Leading to Privilege Escalation
CVE-2026-72643 7.1 HIGH Incorrect Authorization in Kibana Agent Builder Leading to Disclosure and Tampering of Pri
CVE-2026-72666 6.8 MEDIUM Authorization Bypass Through User-Controlled Key in Kibana Leading to Unauthorized Query E
CVE-2026-72631 6.5 MEDIUM Improper Privilege Management in Kibana Fleet Leading to Over-Scoped Elastic Agent API Key
CVE-2026-72661 6.5 MEDIUM Missing Authorization in Kibana Leading to Information Disclosure
CVE-2026-49089 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Servic
CVE-2026-72684 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of
CVE-2026-72663 6.5 MEDIUM Inefficient Algorithmic Complexity in Kibana Leading to Denial of Service
CVE-2026-72636 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Wildcard Matching Leading to Denial of Service
CVE-2026-72657 6.5 MEDIUM Authorization Bypass Through User-Controlled Key in Fleet Server Leading to Information Di

Showing top 20 of 48 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Eck Operator
Same vendor: Elastic
Same weakness: CWE-441

V. Comments for CVE-2026-72640

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